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<h1 id="firstHeading" class="firstHeading"><span style="font-size:0.7em; line-height:130%">std::basic_osyncstream&lt;CharT,Traits,Allocator&gt;::</span>basic_osyncstream</h1>
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<table class="t-dcl-begin"><tbody>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp">basic_osyncstream<span class="br0">(</span> streambuf_type<span class="sy2">*</span> buf, <span class="kw4">const</span> Allocator<span class="sy3">&amp;</span> a <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (1) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_osyncstream<span class="br0">(</span> streambuf_type<span class="sy2">*</span> buf <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (2) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp">basic_osyncstream<span class="br0">(</span> <a href="../basic_ostream.html"><span class="kw1719">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os, <span class="kw4">const</span> Allocator<span class="sy3">&amp;</span> a <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (3) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp"><span class="kw1">explicit</span> basic_osyncstream<span class="br0">(</span> <a href="../basic_ostream.html"><span class="kw1719">std::<span class="me2">basic_ostream</span></span></a><span class="sy1">&lt;</span>CharT, Traits<span class="sy1">&gt;</span><span class="sy3">&amp;</span> os <span class="br0">)</span><span class="sy4">;</span></span></div></td>
<td> (4) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl">
<td> <div><span class="mw-geshi cpp source-cpp">basic_osyncstream<span class="br0">(</span> <a href="../basic_osyncstream.html"><span class="kw2651">std::<span class="me2">basic_osyncstream</span></span></a><span class="sy3">&amp;&amp;</span> other <span class="br0">)</span> <span class="kw1">noexcept</span><span class="sy4">;</span></span></div></td>
<td> (5) </td>
<td class="t-dcl-nopad">  </td>
</tr>
<tr class="t-dcl-sep"><td></td><td></td><td></td></tr>
</tbody></table>
<p>Constructs new synchronized output stream
</p>
<div class="t-li1"><span class="t-li">1-4)</span> constructs the private member <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../basic_syncbuf.html"><span class="kw2652">std::<span class="me2">basic_syncbuf</span></span></a></span></span> using the buffer and the allocator provided, and initializes the base class with a pointer to the member <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../basic_streambuf.html"><span class="kw1670">std::<span class="me2">basic_streambuf</span></span></a></span></span>.</div>
<div class="t-li1"><span class="t-li">5)</span> Move constructor. Move-constructs the <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../basic_ostream.html"><span class="kw1719">std::<span class="me2">basic_ostream</span></span></a></span></span> base and the std::basic_syncbuf member from the corresponding subobjects of <code>other</code>, then calls <a href="../basic_ios/set_rdbuf.html" title="cpp/io/basic ios/set rdbuf"><tt>set_rdbuf</tt></a> with the pointer to the newly-constructed underlying <span class="t-c"><span class="mw-geshi cpp source-cpp"><a href="../basic_syncbuf.html"><span class="kw2652">std::<span class="me2">basic_syncbuf</span></span></a></span></span> to complete the initialization of the base. After this move constructor, <span class="t-c"><span class="mw-geshi cpp source-cpp">other.<span class="me1">get_wrapped</span><span class="br0">(</span><span class="br0">)</span></span></span> returns <span class="t-c"><span class="mw-geshi cpp source-cpp">nullptr</span></span> and destruction of <code>other</code> produces no output.</div>
<h3><span class="mw-headline" id="Parameters">Parameters</span></h3>
<table class="t-par-begin">


<tr class="t-par">
<td>  buf
</td>
<td> -
</td>
<td>  pointer to the <span class="t-lc"><a href="../basic_streambuf.html" title="cpp/io/basic streambuf">std::basic_streambuf</a></span> that will be wrapped
</td></tr>
<tr class="t-par">
<td>  os
</td>
<td> -
</td>
<td>  reference to a <span class="t-lc"><a href="../basic_ostream.html" title="cpp/io/basic ostream">std::basic_ostream</a></span>, whose rdbuf() will be wrapped
</td></tr>
<tr class="t-par">
<td>  a
</td>
<td> -
</td>
<td>  the allocator to pass to the constructor of the member <span class="t-lc">std::basic_syncbuf</span>
</td></tr>
<tr class="t-par">
<td>  other
</td>
<td> -
</td>
<td>  another osyncstream to move from
</td></tr></table>
<h3><span class="mw-headline" id="Example">Example</span></h3>
<div class="t-example"><div class="t-example-live-link"><div class="coliru-btn coliru-btn-run-init">Run this code</div></div>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="cpp source-cpp"><pre class="de1"><span class="co2">#include &lt;string_view&gt;</span>
<span class="co2">#include &lt;syncstream&gt;</span>
<span class="co2">#include &lt;iostream&gt;</span>
<span class="co2">#include &lt;thread&gt;</span>
 
<span class="kw4">void</span> worker<span class="br0">(</span><span class="kw4">const</span> <span class="kw4">int</span> id, <a href="../basic_ostream.html"><span class="kw1733">std::<span class="me2">ostream</span></span></a> <span class="sy3">&amp;</span>os<span class="br0">)</span> <span class="br0">{</span>
  <a href="../../string/basic_string_view.html"><span class="kw1251">std::<span class="me2">string_view</span></span></a> block<span class="sy4">;</span>
  <span class="kw1">switch</span> <span class="br0">(</span>id<span class="br0">)</span> <span class="br0">{</span>
    <span class="kw1">default</span><span class="sy4">:</span> <span class="br0">[</span><span class="br0">[</span>fallthrough<span class="br0">]</span><span class="br0">]</span><span class="sy4">;</span>
    <span class="kw1">case</span> <span class="nu0">0</span><span class="sy4">:</span> block <span class="sy1">=</span> <span class="st0">"██"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
    <span class="kw1">case</span> <span class="nu0">1</span><span class="sy4">:</span> block <span class="sy1">=</span> <span class="st0">"▓▓"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
    <span class="kw1">case</span> <span class="nu0">2</span><span class="sy4">:</span> block <span class="sy1">=</span> <span class="st0">"▒▒"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
    <span class="kw1">case</span> <span class="nu0">3</span><span class="sy4">:</span> block <span class="sy1">=</span> <span class="st0">"░░"</span><span class="sy4">;</span> <span class="kw1">break</span><span class="sy4">;</span>
  <span class="br0">}</span>
  <span class="kw1">for</span><span class="br0">(</span><span class="kw4">int</span> i <span class="sy1">=</span> <span class="nu0">1</span><span class="sy4">;</span> i <span class="sy1">&lt;=</span> <span class="nu0">50</span><span class="sy4">;</span> <span class="sy2">++</span>i<span class="br0">)</span> <span class="br0">{</span>
    os <span class="sy1">&lt;&lt;</span> block <span class="sy1">&lt;&lt;</span> <a href="../manip/flush.html"><span class="kw1794">std::<span class="me2">flush</span></span></a><span class="sy4">;</span>
  <span class="br0">}</span>
  os <span class="sy1">&lt;&lt;</span> <a href="../manip/endl.html"><span class="kw1795">std::<span class="me2">endl</span></span></a><span class="sy4">;</span>
<span class="br0">}</span>
 
<span class="kw4">int</span> main<span class="br0">(</span><span class="br0">)</span> <span class="br0">{</span>
  <a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"Synchronized output should not cause any interference:"</span> <span class="sy1">&lt;&lt;</span> <a href="../manip/endl.html"><span class="kw1795">std::<span class="me2">endl</span></span></a><span class="sy4">;</span>
  <span class="br0">{</span>
    <span class="kw4">auto</span> scout1 <span class="sy1">=</span> <a href="../basic_osyncstream.html"><span class="kw2653">std::<span class="me2">osyncstream</span></span></a><span class="br0">{</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> scout2 <span class="sy1">=</span> <a href="../basic_osyncstream.html"><span class="kw2653">std::<span class="me2">osyncstream</span></span></a><span class="br0">{</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> scout3 <span class="sy1">=</span> <a href="../basic_osyncstream.html"><span class="kw2653">std::<span class="me2">osyncstream</span></span></a><span class="br0">{</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> scout4 <span class="sy1">=</span> <a href="../basic_osyncstream.html"><span class="kw2653">std::<span class="me2">osyncstream</span></span></a><span class="br0">{</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w1 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">0</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span>scout1<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w2 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">1</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span>scout2<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w3 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">2</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span>scout3<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w4 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">3</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span>scout4<span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
  <span class="br0">}</span>
 
  <a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a> <span class="sy1">&lt;&lt;</span> <span class="st0">"<span class="es1">\n</span>Lack of synchronization may cause some interference on output:"</span> <span class="sy1">&lt;&lt;</span> <a href="../manip/endl.html"><span class="kw1795">std::<span class="me2">endl</span></span></a><span class="sy4">;</span>
  <span class="br0">{</span>
    <span class="kw4">auto</span> w1 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">0</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w2 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">1</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w3 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">2</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
    <span class="kw4">auto</span> w4 <span class="sy1">=</span> <a href="../../thread/jthread.html"><span class="kw3240">std::<span class="me2">jthread</span></span></a><span class="br0">{</span>worker, <span class="nu0">3</span>, <a href="../../utility/functional/ref.html"><span class="kw1071">std::<span class="me2">ref</span></span></a><span class="br0">(</span><a href="../cout.html"><span class="kw1762">std::<span class="me2">cout</span></span></a><span class="br0">)</span><span class="br0">}</span><span class="sy4">;</span>
  <span class="br0">}</span>
<span class="br0">}</span></pre></div></div>
<p>Possible output:
</p>
<div dir="ltr" class="mw-geshi" style="text-align: left;"><div class="text source-text"><pre class="de1">Synchronized output should not cause any interference:
░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░░
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒
▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓
████████████████████████████████████████████████████████████████████████████████████████████████████
 
Lack of synchronization may cause some interference on output:
████▓▓██▒▒▒▒▓▓██░░▒▒██░░▒▒░░░░▒▒░░▓▓▒▒██░░████████████▓▓██████▓▓▒▒▓▓██░░████▓▓▓▓██▒▒░░░░░░░░▓▓░░▓▓██▒▒▒▒▒▒▒▒▓▓██▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒▒▒░░▒▒▒▒▒▒▒▒▒▒▓▓▒▒▒▒▒▒▒▒▒▒▒▒██░░░░░░░░▓▓▓▓▓▓▓▓▓▓▓▓▓▓░░▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓▓████████▓▓▓▓▓▓▓▓▓▓▓▓░░▓▓▓▓
▒▒▒▒██░░██████████████████████████░░░░░░░░░░░░░░██░░▒▒░░░░░░██████████████████
▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒▒░░▒▒░░░░░░░░░░░░░░░░░░░░░░░░░░░░▒▒▒▒▒▒
░░░░░░</pre></div></div> 
</div>
<h3><span class="mw-headline" id="See_also">See also</span></h3>
<table class="t-dsc-begin">

<tr class="t-dsc">
<td>  <div class="t-dsc-member-div t-dsc-member-nobold-div"><div><a href="../basic_syncbuf/basic_syncbuf.html" title="cpp/io/basic syncbuf/basic syncbuf"> <span class="t-lines"><span>(constructor)</span></span></a></div></div>
</td>
<td>  constructs a basic_syncbuf object <br> <span class="t-mark">(public member function of <code>std::basic_syncbuf&lt;CharT,Traits,Allocator&gt;</code>)</span> </td></tr>
</table>

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